For every 2 mochi balls that Lucy has, Cindy has 7 more mochi balls than her. They have 66 mochi balls altogether. How many mochi balls does Cindy have?
Number of mochi balls that Cindy has in 1 set
= 2 + 7
= 9
Total number of mochi balls in 1 set
= 9 + 2
= 11
Number of sets
= 66 ÷ 11
= 6
Number of mochi balls that Cindy has
= 6 x 9
= 54
Answer(s): 54